How do I get my ferrets to stop pooping in the corner?

My ferrets all poop in the litter box...sometimes. I just got 2 new ferrets that are 1 year 1/2, and they don't really like to use it. Is it because they smell my other ferrets scent in the litter box? I have two litter boxes one in the cage and one outside but thier favorite corner is behind the door...I... show more My ferrets all poop in the litter box...sometimes. I just got 2 new ferrets that are 1 year 1/2, and they don't really like to use it. Is it because they smell my other ferrets scent in the litter box? I have two litter boxes one in the cage and one outside but thier favorite corner is behind the door...I obviously can't put a litter box there so what do I do?
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